<Page>


                                                                     Exhibit 3.1


                           THIRD AMENDED AND RESTATED

                          CERTIFICATE OF INCORPORATION

                                       OF

                           PETCO ANIMAL SUPPLIES, INC.



                  PETCO ANIMAL SUPPLIES, INC., a corporation organized and
existing under the General Corporation Law of the State of Delaware (the
"General Corporation Law"), hereby certifies as follows:

                  1.       The name of this corporation is PETCO Animal
Supplies, Inc. The Corporation was originally incorporated under the name PASI
SHELL COMPANY, and the original Certificate of Incorporation was filed with the
Secretary of State of the State of Delaware on April 9, 1991.

                  2.       Pursuant to Sections 228, 242 and 245 of the General
Corporation Law, this Third Amended and Restated Certificate of Incorporation
further restates and integrates and amends the provisions of the Certificate of
Incorporation of PETCO Animal Supplies, Inc.

                  3.       The text of the Certificate of Incorporation as
heretofore amended or supplemented is hereby restated and amended to read in its
entirety as follows:

                  "FIRST:  The name of the corporation (hereinafter the
                  "Corporation") is

                                    PETCO ANIMAL SUPPLIES, INC.

                  SECOND:  The address of the registered office of the
                  Corporation in the State of Delaware is 2711 Centerville Road,
                  Suite 400, in the City of Wilmington, County of New Castle.
                  The name of the registered agent of the Corporation at that
                  address is the Corporation Service Company.


<Page>


                  THIRD:   The nature of the business or purposes to be
                  conducted or promoted is to engage in any lawful act or
                  activity for which corporations may be organized under the
                  General Corporation Law of the State of Delaware (the "General
                  Corporation Law").

                  FOURTH:  The Corporation is authorized to issue two classes of
                  stock to be designated, respectively, "Common Stock" and
                  "Preferred Stock." The total number of shares of which the
                  Corporation shall have authority to issue is Two Hundred Fifty
                  Five Million (255,000,000) of which (i) Two Hundred Fifty
                  Million (250,000,000) shares shall be Common Stock, par value
                  $.001 per share, and (ii) Five Million (5,000,000) shares
                  shall be Preferred Stock, par value $.01 par share.

                           The Preferred Stock may be issued from time to time
                  in one or more series, each series to be appropriately
                  designated by a distinguishing letter or title, prior to the
                  issue of any shares thereof. The Board of Directors is hereby
                  authorized, by filing a certificate pursuant to the General
                  Corporation Law, to fix or alter from time to time the
                  designation, powers, preferences, privileges and rights of the
                  shares of each such series, including, without limitation, the
                  dividend rights, dividend rate, conversion rights, voting
                  rights, rights and terms of redemption (including sinking fund
                  provisions, if any), the redemption price or prices, the
                  liquidation preferences, any other designations, preferences
                  and relative, participating, optional or other special rights,
                  and any qualifications, limitations or restrictions thereof,
                  of any wholly unissued series of Preferred Stock, and the
                  number of shares constituting any such unissued series and the
                  designation thereof, or any of the foregoing; and to increase
                  (but not above the total number of authorized shares of the
                  class) or decrease (but not below the number of shares of such
                  series then outstanding) the number of shares of any series of
                  Preferred Stock subsequent to the issue of shares of that
                  series. In case the number of shares of any series shall be so
                  decreased, the shares constituting such decrease shall resume
                  the status which they had prior to the adoption of the
                  resolution originally fixing the number of shares of such
                  series.

                  FIFTH:   The Corporation is to have perpetual existence.

                  SIXTH:   1.       The business and affairs of the Corporation
                  shall be managed by or under the direction of a Board of
                  Directors. The authorized number of directors shall be set
                  forth in the Bylaws of the Corporation as adopted or as set
                  from time to time by an amendment to the Bylaws duly adopted
                  by the Board of Directors or by the stockholders.

                           2.       The directors shall be divided into three
                  classes, designated Class I, Class II and Class III. The
                  number of directors in each class shall be the whole number
                  contained in the quotient arrived at by dividing the number of
                  directors by three, and if a fraction is also contained in
                  such quotient then if such fraction is one-third (1/3) the
                  extra director shall be a member of Class III and if the
                  fraction


<Page>


                  is two-thirds (2/3) one of the extra directors shall be a
                  member of Class III and the other shall be a member of Class
                  II. Each director shall serve for a term ending on the date of
                  the third annual meeting of stockholders next following the
                  annual meeting at which such director was elected, provided
                  that directors initially designated as Class I directors shall
                  serve for a term ending on the date of the 2003 annual
                  meeting, directors initially designated as Class II directors
                  shall serve for a term ending on the date of the 2004 annual
                  meeting and directors initially designated as Class III
                  directors shall serve for a term ending on the date of the
                  2005 annual meeting. Notwithstanding the foregoing, each
                  director shall hold office until such director's successor
                  shall have been duly elected and qualified or until such
                  director's earlier death, resignation or removal. If the
                  number of directors is changed, any increase or decrease shall
                  be apportioned among the classes so as to maintain the number
                  of directors in each class as nearly equal as possible, but in
                  no event will a decrease in the number of directors shorten
                  the term of any incumbent director. Vacancies on the Board of
                  Directors resulting from death, resignation, removal or
                  otherwise and newly created directorships resulting from any
                  increase in the number of directors may be filled solely by a
                  majority of the directors then in office (although less than a
                  quorum) or by a sole remaining director, and each director so
                  elected shall hold office for a term that shall coincide with
                  the remaining term of the class to which such director shall
                  have been elected. Whenever the holders of one or more classes
                  or series of Preferred Stock shall have the right, voting
                  separately as a class or series, to elect directors, the
                  nomination, election, term of office, filling of vacancies,
                  removal and other features of such directorships shall not be
                  governed by this ARTICLE SIXTH unless otherwise provided for
                  in the certificate of designation for such classes or series.

                           3.       No director may be removed from office by
                  the stockholders except for cause with the affirmative vote of
                  the holders of not less than a majority of the total voting
                  power of all outstanding securities of the Corporation then
                  entitled to vote generally in the election of directors,
                  voting together as a single class.

                  SEVENTH: The following provisions are inserted for the
                  management of the business and the conduct of the affairs of
                  the Corporation and for the further definition of the powers
                  of the Corporation and its directors and stockholders:

                           1.       In furtherance and not in limitation of the
                  power conferred by statute, the Board of Directors is
                  expressly authorized to make, alter or repeal the bylaws of
                  the Corporation.

                                    The stockholders may adopt, amend or repeal
                  the bylaws only with the affirmative vote of the holders of
                  not less than 66 2/3% of the total voting power of all
                  outstanding securities of the Corporation then entitled to
                  vote generally in the election of directors, voting together
                  as a single class.


<Page>


                           2.       Elections of directors need not be by
                  written ballot unless the bylaws of the Corporation so
                  provide.

                           3.       Any action required or permitted to be taken
                  at any annual or special meeting of stockholders may be taken
                  only upon the vote of stockholders at an annual or special
                  meeting duly noticed and called in accordance with the General
                  Corporation Law, and may not be taken by written consent of
                  stockholders without a meeting.

                           4.       Special meetings of stockholders may be
                  called by the Board of Directors, the Chairman of the Board of
                  Directors, the President or the Secretary of the Corporation
                  and may not be called by any other person. Notwithstanding the
                  foregoing, whenever holders of one or more classes or series
                  of Preferred Stock shall have the right, voting separately as
                  a class or series, to elect directors, such holders may call
                  special meetings of such holders pursuant to the certificate
                  of designation for such classes or series.

                  EIGHTH:  No director of this Corporation shall be personally
                  liable to the Corporation or its stockholders for monetary
                  damages for breach of fiduciary duty as a director, except for
                  liability (i) for any breach of the director's duty of loyalty
                  to the Corporation or its stockholders, (ii) for acts or
                  omissions not in good faith or which involve intentional
                  misconduct or a knowing violation of the law, (iii) under
                  Section 174 of the General Corporation Law or (iv) for any
                  transaction from which the director derived an improper
                  personal benefit.

                           If the General Corporation Law is hereafter amended
                  to authorize corporate action further limiting or eliminating
                  the personal liability of directors, then the liability of the
                  director to the Corporation shall be limited or eliminated to
                  the fullest extent permitted by the General Corporation Law,
                  as so amended from time to time. Any repeal or modification of
                  this Article EIGHTH by the stockholders of the Corporation
                  shall be prospective only, and shall not adversely affect any
                  limitation on the personal liability of a director of the
                  Corporation existing at the time of such repeal or
                  modification.

                  NINTH:   The Corporation reserves the right to amend, alter,
                  change or repeal any provisions contained in this Certificate
                  of Incorporation, in the manner now or hereafter prescribed by
                  the General Corporation Law; PROVIDED, HOWEVER, that no
                  amendment, alteration, change or repeal may be made to
                  Articles SIXTH, SEVENTH and NINTH without the affirmative vote
                  of the holders of not less than 66 2/3% of the total voting
                  power of all outstanding securities of the Corporation then
                  entitled to vote generally in the election of directors,
                  voting together as a single class. All rights at any time
                  conferred upon the stockholders of the Corporation by this
                  Certificate of Incorporation are granted subject to the
                  provisions of this Article NINTH.

                  TENTH:   Meetings of stockholders may be held within or
                  without the State


<Page>


                  of Delaware, as the bylaws of the Corporation may provide. The
                  books of the Corporation may be kept (subject to any provision
                  contained in the General Corporation Law) outside of the State
                  of Delaware at such place or places as may be designated from
                  time to time by the Board of Directors of the Corporation or
                  in the bylaws of the Corporation.

                  ELEVENTH: Each reference in this Certificate of Incorporation
                  to any provision of the General Corporation Law refers to the
                  specified provision of the General Corporation Law of the
                  State of Delaware, as the same now exists or as it may
                  hereafter be amended or superseded."

                  4.       The foregoing amendment and restatement of the
Certificate of Incorporation has been duly approved and adopted by the Board of
Directors and the stockholders of the Corporation in accordance with the
provisions of Sections 228, 242 and 245 of the General Corporation Law.




                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]


<Page>


                  IN WITNESS WHEREOF, PETCO ANIMAL SUPPLIES, INC. has caused
this Certificate to be signed by Brian K. Devine, its Chief Executive Officer
and President, and James M. Myers, its Secretary, this 27th day of February,
2002.



                                     PETCO ANIMAL SUPPLIES, INC.
                                     a Delaware corporation



                                     By:   /s/ Brian K. Devine
                                           -------------------------------------
                                           Brian K. Devine
                                           Chief Executive Officer and President


ATTEST



By:   /s/ James M. Myers
      ---------------------------
      James M. Myers
      Secretary